Fig. 2From: Glass eel migration in an urbanized catchment: an integral bottleneck assessment using mark-recaptureAverage migration speed (km/day) of recaptured tagged glass eels released at the IJmuiden Sluice complex either the seaside (SS) or directly behind the barrier at the canal side (CS) on March 26th, 29th and April 8th and 16th, 2018. Error bars indicate standard error; n.s. = no significant difference was found (p > 0.05)Back to article page